Added/changed:
- Spoilage for fast-perishing resources is now slower in cold months (November through March)
- Updated a help page about shelf life (resource list added)
- Added hotkeys to jump to next/previous building of the same type (arrow keys by default)
Fixed:
- Family tree tooltips didn't work if both parents are dead
- A small memory leak
- Top bar popups didn't work when the world map was open
